What's the difference between these two curves for AC Generator?

[Physical_Fire]

 

[Dale]

One uses numbers for labels while the other uses letters.

 

[BvU]

And one is current, the other voltage

You'll keep getting this kind of corny answers until you improve your question...

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[Physical_Fire]

Why are the curves different? One revolution in the yellow picture is different to the one underneath it. The second picture looks like a cosine curve if started from 1. And how would I know how to draw 2 revolution curve? I am confused.

 

[BvU]

You're not doing it deliberately, but the top picture in post #1 goes with the bottom picture in #4. Confusion lurks .

An important relationship in this is Faraday's law: $\quad\varepsilon = -{d\Phi\over dt}$.

Can you see how the two pictures agree in that respect ?

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[Physical_Fire]

I don't get it. Please explain

 

[BvU]

I don't get it. Please explain

On what level ? What do you know already ? About electromagnetic induction, Faraday's law, AC generators, etc ?

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[Physical_Fire]

Yeah I know those. I don't his equation although.

 

[vanhees71]

The figures only can belong together if your circuit contains only a resistor, because if there were capacitors and/or coils present there'd be a phase shift between the EMF (sometimes confusingly called "voltage") and the current.

 

[BvU]

I don't think we should complicate things for the OP .

I don't (know) his equation although (edits: BvU)

Ok, but the question was

What do you know already ?

Lenz's law, Lorentz force, ... ?

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[Dale]

Why are the curves different? One revolution in the yellow picture is different to the one underneath it

I don’t see any differences between the two pictures other than stylistic differences. The concept and the content are the same.

Can you be very specific and clear about what you see that is different to you?

 

[Gavran]

There are two notes, “1 cycle” in the first picture and “one revolution” in the second picture. Each of them shows what one cycle is or what one revolution is. But the cycle showed by the note “1 cycle” in the first picture is not the same as the cycle showed by the note “one revolution” in the second picture. “1 cycle” defines a revolution that begins from no. of rotations = 0 or from Time = 0 s, while “one revolution” defines a revolution that begins from Time = T/4 or from no. of rotations = 1/4. Which one will be used depends on which picture will be used in the process description. Every curve pattern, which is a revolution, must satisfied the condition that it can start at Time = t, where t can be any real number and it must end at Time = t + T where T is a period.

There is not a difference between two curves in two different pictures. Both of them describe the same process. The first revolution, in accordance with the definition of a revolution by the note “1 cycle” in the first picture, in the first picture begins from no. of rotations = 0 where e.m.f. = 0 V. Corresponding value of no. of rotations = 0 in the first picture is Time = 0 s in the second picture. The first revolution, in accordance with the definition of a revolution by the note “1 cycle” in the first picture, in the second picture begins from Time = 0 s where E.m.f. = 0 V.